<div class="menu">
    <ul>
        <a href="<?php echo $this->baseUrl(); ?>/admin/users">
            <li class="<?php echo $this->users; ?>" >Пользователи</li></a>
        <a href="<?php echo $this->baseUrl(); ?>/admin/categories">
            <li class="<?php echo $this->categories; ?>" >Категории</li></a>
    </ul>
</div>